 | [TWC] Cable Modem Resets Hello,
I've had TWC RR for about a decade and in the past few months I've been noticing that my cable modem is rebooting a lot more than it used to. 3-5 times a week that I notice (twice tonight alone). It also seems, and it could be my mind playing tricks on me, that it tends to happen when I first try to load a webpage or sign a new device onto the network. Again, could just be coincidence.
I am using the original cable modem from the installation approx. 10 years ago which is a Motorola SB4100. Nothing has changed from an environment standpoint that I'm aware of (desk hasn't moved, no new cables, etc).
In the modem logs I see Critical messages such as "No Ranging Response Received - T3 Timeout"
which are then followed by BOOTING messages, attempt to acquire upstream, failure to acquire upstream, etc.
The modem is never out for more than a minute or two, but I never recall it dropping the connection like this in the past on such a "frequent" basis.
I've googled around and it seems signal to noise can cause this behavior? Currently my SNR reads 36db. I guess my main question would be is there anything I can do to pinpoint the cause of this, specifically if it's a faulty modem or something beyond that? Or if there are any preventative measures that could be taken?
Any help would be appreciated. Thanks |
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 hobgoblinSortof AgoblinPremium join:2001-11-25 Orchard Park, NY kudos:8 | Do yourself a favor, get rid of that modem, the sooner the better.
Hob |
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 kilrathi join:2005-04-22 Rockaway Park, NY Reviews:
·Time Warner Cable
| reply to mpgstuff T3 timeout errors are related to upstream noise or modem unable to communicate with cmts as in send info to cmts, this either means u have upstream noise/packet loss or smaller chance that the modem is bad, but if I was a betting man I would say there is upstream signal issue. Of course 10 year old modem definitely means u wanna try to replace it for a new one and see what happens. |
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 | reply to mpgstuff Thanks for the responses.
Is it a "painful" process to get a new modem through TWC? Or can I just call up/visit my local TWC office and they'll swap it out? There wouldn't be any reason they'd want a technician to make a house call for a modem swap, correct? And then to provision the modem, is it just an automated phone process (when I got a new cable box they shipped it to the house, then there was some phone # I called to provision the box) ?
Is there a standard cable modem that TWC is giving out nowadays? Or is it dependent on area? |
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 PCInTechkeeping art alive since 1953Premium join:2004-06-07 Massena, NY kudos:9 | In most areas, it's an over the counter swap. Painless. |
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 | reply to mpgstuff The most pain you'll have at a front counter is the wait, depending on the area (Mine ususally has one or two people, some places have a line out the door of what I've heard). Otherwise it's just swap and go. |
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 | reply to mpgstuff Thanks for the replies folks. I will probably pursue getting a replacement modem from the local TWC office.
The resets/T3 Timeouts seem to happen primarily during hours of 6PM-10PM, but again, that could just be me noticing it during this time frame since that's generally when I use the connection the most. |
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 | reply to mpgstuff I've had this issue at least twice for a period of weeks, but it went away on its own (presumably with the help of TW network technicians). So the modem might not be the problem, though one that old might not be giving you the best performance... |
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 | reply to mpgstuff Get a new modem first and foremost. You are likely paying the lease fee, no reason not to have a new modem.
If the problem still exists, browse to the 192.168.100.1 page and post the signal information so as to assist us armchair techs  |
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 | reply to mpgstuff I agree this modem is quite old and I immediately become suspicious of it whenever I have a problem. Although as another user mentioned, things seem to always clear up after a week or so. Looking back at my older posts over the years here seems to confirm this.
This particular issue has been going on for at least a couple of months now, some weeks worse than others, with an average modem reset of about once per day (that I notice). Other than this hiccup I'd say my service is good.
I will hold out about one more week. According to the RR status page for my area there is scheduled "HUB" maintenance this Thursday for the city I am in. I'm not sure if this maintenance has the potential of fixing my issue, but I will see. If it doesn't, I will take action beginning with obtaining a new modem.
Thanks |
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 hobgoblinSortof AgoblinPremium join:2001-11-25 Orchard Park, NY kudos:8 | Once again......get rid of the modem.
Thank You.
Hob |
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 | reply to mpgstuff The modem is old and yes it should be/will be replaced.
I guess my question is, can we say for sure the modem is the primary reason for this happening? Or is it really something on the line/TWC's problem? If I get a new modem (which yes, I agree this one is old and severely outdated and I should get one anyway for no net $ increase) but the same issue continues to happen, what is the next thing to look for?
My modem just reset, here are the logs currently on the device. Looks like there are several reboots in here in the span of ~24 hours: 121127174642 8-Debug M570.2 Motorola CM certificate present 121127174642 8-Debug M571.7 CM Cert Upgrade Enabled. AutoRun after Reg or via SNMP 121127174642 8-Debug I503.0 Cable Modem is OPERATIONAL 121127174642 8-Debug F502.1 Bridge Forwarding Enabled. 121127174642 7-Information B401.0 Authorized 121127174641 8-Debug F502.3 Bridge Learning Enabled. 121127174641 8-Debug B961.2 Retrieved CA Cert from Secure DL sector successfully 121127174641 7-Information B0.0 Baseline Privacy 121127174639 7-Information X518.9 Configuration - GGFMMD - Unit Update Enabled by CVC 121127174639 8-Debug I500.3 DOCSIS 1.1 Registration Completed 121127174639 7-Information I500.5 Attempting DOCSIS 1.1 Registration 121127174639 7-Information D509.0 Retrieved TFTP Config File SUCCESS 121127174639 7-Information D507.0 Retrieved Time....... SUCCESS ************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS ************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1 ************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day ************ 7-Information T500.0 Acquired Upstream .......... SUCCESS ************ 8-Debug T503.1 Acquire US with status OK, powerLevel 47, tempSid 726 ************ 8-Debug T505.0 Acquired Upstream with status OK ************ 3-Critical R2.0 No Ranging Response received - T3 timeout ************ 7-Information T501.0 Acquired Downstream (693000000 Hz)........ SUCCESS ************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 693000000, US Id 2 ************ 7-Information H501.2 HFC: Shutting Downstream Down ************ 8-Debug T503.1 Acquire US with status RR Change, powerLevel 36, tempSid 0 ************ 8-Debug T505.0 Acquired Upstream with status RR Change ************ 3-Critical R2.0 No Ranging Response received - T3 timeout ************ 7-Information T501.0 Acquired Downstream (711000000 Hz)........ SUCCESS ************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 711000000, US Id 2 ************ 7-Information I510.0 *** BOOTING *** SB4100-1.4.9.9-SCM02-NOSH 121127174544 4-Error T520.0 Fail to change upstream from UCC REQ 121127174544 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 2 121127174544 8-Debug T505.0 Acquired Upstream with status RR ABORT 121127174542 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 1 121127174542 8-Debug T505.0 Acquired Upstream with status RR ABORT 121127174538 7-Information H501.1 HFC: Shutting Upstream Down 121127174538 8-Debug F502.2 Bridge Forwarding Disabled. 121127174537 7-Information C100.0 UCC-RSP Upstream Channel Change Response 121127155345 8-Debug F502.1 Bridge Forwarding Enabled. 121127155343 7-Information C400.0 DCC-ACK Dynamic Channel Change Acknowledgement 121127155343 4-Error B923.0 Error extracting Author Reject Msg 121127155343 7-Information B922.0 Ignore invalid error code 10 121127155343 7-Information C203.0 DCC arrive new 121127155343 7-Information C300.0 DCC-RSP Dynamic Channel Change Response 121127155342 7-Information H501.1 HFC: Shutting Upstream Down 121127155342 7-Information T501.0 Acquired Downstream (711000000 Hz)........ SUCCESS 121127155342 8-Debug T509.0 Acquired DS with status OK, DS Freq 705000000, US Id 2 121127155341 7-Information H501.2 HFC: Shutting Downstream Down 121127155341 8-Debug F502.2 Bridge Forwarding Disabled. 121127155341 7-Information C202.0 DCC depart old 121127155341 7-Information C300.0 DCC-RSP Dynamic Channel Change Response 121127155341 7-Information C200.0 DCC-REQ Dynamic Channel Change Request 121127081820 8-Debug M570.2 Motorola CM certificate present 121127081820 8-Debug M571.7 CM Cert Upgrade Enabled. AutoRun after Reg or via SNMP 121127081820 8-Debug I503.0 Cable Modem is OPERATIONAL 121127081820 8-Debug F502.1 Bridge Forwarding Enabled. 121127081820 7-Information B401.0 Authorized 121127081819 8-Debug F502.3 Bridge Learning Enabled. 121127081819 8-Debug B961.2 Retrieved CA Cert from Secure DL sector successfully 121127081819 7-Information B0.0 Baseline Privacy 121127081817 7-Information X518.9 Configuration - GGFMMD - Unit Update Enabled by CVC 121127081817 8-Debug I500.3 DOCSIS 1.1 Registration Completed 121127081817 7-Information I500.5 Attempting DOCSIS 1.1 Registration 121127081817 7-Information D509.0 Retrieved TFTP Config File SUCCESS 121127081817 7-Information D507.0 Retrieved Time....... SUCCESS ************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS ************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1 ************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day ************ 7-Information T500.0 Acquired Upstream .......... SUCCESS ************ 8-Debug T503.1 Acquire US with status OK, powerLevel 47, tempSid 726 ************ 8-Debug T505.0 Acquired Upstream with status OK ************ 3-Critical R2.0 No Ranging Response received - T3 timeout ************ 7-Information T501.0 Acquired Downstream (711000000 Hz)........ SUCCESS ************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 711000000, US Id 1 ************ 7-Information I510.0 *** BOOTING *** SB4100-1.4.9.9-SCM02-NOSH 121127081736 4-Error T520.0 Fail to change upstream from UCC REQ 121127081736 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 2 121127081736 8-Debug T505.0 Acquired Upstream with status RR ABORT 121127081732 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 1 121127081732 8-Debug T505.0 Acquired Upstream with status RR ABORT 121127081726 7-Information H501.1 HFC: Shutting Upstream Down 121127081726 8-Debug F502.2 Bridge Forwarding Disabled. 121127081725 7-Information C100.0 UCC-RSP Upstream Channel Change Response 121127011831 8-Debug M570.2 Motorola CM certificate present 121127011831 8-Debug M571.7 CM Cert Upgrade Enabled. AutoRun after Reg or via SNMP 121127011831 8-Debug I503.0 Cable Modem is OPERATIONAL 121127011831 8-Debug F502.1 Bridge Forwarding Enabled. 121127011831 7-Information B401.0 Authorized 121127011830 8-Debug F502.3 Bridge Learning Enabled. 121127011830 8-Debug B961.2 Retrieved CA Cert from Secure DL sector successfully 121127011830 7-Information B0.0 Baseline Privacy 121127011827 7-Information X518.9 Configuration - GGFMMD - Unit Update Enabled by CVC 121127011827 8-Debug I500.3 DOCSIS 1.1 Registration Completed 121127011827 7-Information I500.5 Attempting DOCSIS 1.1 Registration 121127011827 7-Information D509.0 Retrieved TFTP Config File SUCCESS 121127011827 7-Information D507.0 Retrieved Time....... SUCCESS ************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS ************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1 ************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day ************ 7-Information T500.0 Acquired Upstream .......... SUCCESS ************ 8-Debug T503.1 Acquire US with status OK, powerLevel 45, tempSid 726 ************ 8-Debug T505.0 Acquired Upstream with status OK ************ 3-Critical R2.0 No Ranging Response received - T3 timeout ************ 3-Critical R6.0 Unicast Maintenance Ranging attempted - No response - Retries exhausted ************ 3-Critical R5.0 Started Unicast Maintenance Ranging - No Response received - T3 timeout ************ 3-Critical R2.0 No Ranging Response received - T3 timeout ************ 7-Information T501.0 Acquired Downstream (711000000 Hz)........ SUCCESS ************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 711000000, US Id 2 ************ 7-Information I510.0 *** BOOTING *** SB4100-1.4.9.9-SCM02-NOSH 121127011727 4-Error T520.0 Fail to change upstream from UCC REQ 121127011727 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 2 121127011727 8-Debug T505.0 Acquired Upstream with status RR ABORT 121127011725 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 1 121127011725 8-Debug T505.0 Acquired Upstream with status RR ABORT 121127011720 7-Information H501.1 HFC: Shutting Upstream Down 121127011720 8-Debug F502.2 Bridge Forwarding Disabled. 121127011719 7-Information C100.0 UCC-RSP Upstream Channel Change Response 121126212225 8-Debug M570.2 Motorola CM certificate present 121126212225 8-Debug M571.7 CM Cert Upgrade Enabled. AutoRun after Reg or via SNMP 121126212225 8-Debug I503.0 Cable Modem is OPERATIONAL 121126212225 8-Debug F502.1 Bridge Forwarding Enabled. 121126212225 7-Information B401.0 Authorized 121126212223 8-Debug F502.3 Bridge Learning Enabled. 121126212223 8-Debug B961.2 Retrieved CA Cert from Secure DL sector successfully 121126212223 7-Information B0.0 Baseline Privacy 121126212221 7-Information X518.9 Configuration - GGFMMD - Unit Update Enabled by CVC 121126212221 8-Debug I500.3 DOCSIS 1.1 Registration Completed 121126212221 7-Information I500.5 Attempting DOCSIS 1.1 Registration 121126212221 7-Information D509.0 Retrieved TFTP Config File SUCCESS 121126212221 7-Information D507.0 Retrieved Time....... SUCCESS ************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS ************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1 ************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day ************ 7-Information T500.0 Acquired Upstream .......... SUCCESS ************ 8-Debug T503.1 Acquire US with status OK, powerLevel 45, tempSid 726 ************ 8-Debug T505.0 Acquired Upstream with status OK ************ 3-Critical R2.0 No Ranging Response received - T3 timeout ************ 7-Information T501.0 Acquired Downstream (711000000 Hz)........ SUCCESS ************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 711000000, US Id 1 ************ 7-Information H501.2 HFC: Shutting Downstream Down ************ 8-Debug T503.1 Acquire US with status RR Change, powerLevel 36, tempSid 0 ************ 8-Debug T505.0 Acquired Upstream with status RR Change ************ 3-Critical R2.0 No Ranging Response received - T3 timeout ************ 7-Information T501.0 Acquired Downstream (693000000 Hz)........ SUCCESS ************ 8-Debug T509.0 Acquired DS with status OK, DS Freq 693000000, US Id 1 ************ 7-Information I510.0 *** BOOTING *** SB4100-1.4.9.9-SCM02-NOSH 121126212129 4-Error T520.0 Fail to change upstream from UCC REQ 121126212129 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 2 121126212129 8-Debug T505.0 Acquired Upstream with status RR ABORT 121126212126 4-Error T508.0 Fail to Acquire upstream, Error Stats RR ABORT, Retry 1 121126212126 8-Debug T505.0 Acquired Upstream with status RR ABORT 121126212122 7-Information H501.1 HFC: Shutting Upstream Down 121126212122 8-Debug F502.2 Bridge Forwarding Disabled. 121126212121 7-Information C100.0 UCC-RSP Upstream Channel Change Response 121126205220 8-Debug M570.2 Motorola CM certificate present 121126205220 8-Debug M571.7 CM Cert Upgrade Enabled. AutoRun after Reg or via SNMP 121126205220 8-Debug I503.0 Cable Modem is OPERATIONAL 121126205220 8-Debug F502.1 Bridge Forwarding Enabled. 121126205220 7-Information B401.0 Authorized 121126205218 8-Debug F502.3 Bridge Learning Enabled. 121126205218 8-Debug B961.2 Retrieved CA Cert from Secure DL sector successfully 121126205218 7-Information B0.0 Baseline Privacy 121126205216 7-Information X518.9 Configuration - GGFMMD - Unit Update Enabled by CVC 121126205216 8-Debug I500.3 DOCSIS 1.1 Registration Completed 121126205216 7-Information I500.5 Attempting DOCSIS 1.1 Registration 121126205216 7-Information D509.0 Retrieved TFTP Config File SUCCESS 121126205216 7-Information D507.0 Retrieved Time....... SUCCESS ************ 7-Information D511.0 Retrieved DHCP .......... SUCCESS ************ 5-Warning D520.2 DHCP Attempt# 1 BkOff: 5s Tot DSC:1 OFF:1 REQ:1 ACK:1 ************ 7-Information D0.0 DHCP CM Net Configuration download and Time of Day ************ 7-Information T500.0 Acquired Upstream .......... SUCCESS ************ 8-Debug T503.1 Acquire US with status OK, powerLevel 46, tempSid 726 ************ 8-Debug T505.0 Acquired Upstream with status OK ************ 3-Critical R2.0 No Ranging Response received - T3 timeout |
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 | only thing i can really see in that is the modem being told to swap upstream channels causing a flap. Not much more I can tell from that. |
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 | reply to mpgstuff Any suggestions on modem models to try to get or try to stay away from? I haven't contacted my local office yet about the swap, but I assume they'll just give me what they have. I have Standard Service.
Are there any reasons to buy my own approved modem vs. leasing (now that the $3.95/month fee is charged)? Aside from breaking even after a few years and no longer incurring the fee? |
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 1 edit | reply to mpgstuff I know I've let this sit for a while, but after contemplating continuing the $3.95 vs. buying, and hoping this issue would go away, I've decided to purchase an SB6141 and will look to provision it next week over the phone. I am hoping this provision process does not turn out to be a nightmare. I am waiting until next week so I can at least ensure I have internet over the holiday weekend.
In the meantime, I have spoke with 2 people in the online chat, and it was pretty much a waste of time.
I spoke with another 2 people via the phone. The first person was pretty helpful, reset the modem, did some tests, acknowledged the timeouts/resets and said she'd send a technician out the following day and they would look in my house and outside (I declined and said I'd try a new modem first. In hindsight, this was probably a terrible idea by me, I should have let the tech come).
The second person I called turned out to be a pretty bad experience. This person insisted that there was no way I could view my modem logs via 192.168.100.1. She insisted that I must have been viewing my Linksys router logs, since that's the device I was connected to. She insisted it was an issue with my Linksys wireless router and a WIFI issue, and maybe a wireless phone was interfering with the WIFI. I explained myself 100 times that the modem was resetting, but it was just not getting through. I asked if this could be escalated just so I could have someone tell me what these messages mean, and she said the escalation was denied because there was no proof of connection issues, and that the senior technician said it was not possible I could be looking at these logs while connected to the device. My modem had reset 5-6 times before calling her, the other service rep acknowledged this (even in her notes on my account), but yet this service rep said she saw no connectivity issues in the last 24 hours.
No configuration changes have been made in my house, no new coax splitters, etc. I'm using the same router that I've had for 2-3 years and I don't believe it is an issue at all.
Hopefully once the new modem is up and running the issue will be resolved. If not, the only other alternative is to have a tech come to the house. I just don't want to be in a situation where I now have a new modem, still have the issue, and they say its a modem issue and its not their problem since I own the modem. |
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 hobgoblinSortof AgoblinPremium join:2001-11-25 Orchard Park, NY kudos:8 | I gave you my advice early in this thread. If you are still using a 4100 modem anything else you have done, calling, chatting was honestly wasting your time and theirs.
Please swap it before you do anything else. Had a tech come out he would have swapped it as a first step.
Hob -- "A foolish consistency is the hobgoblin of little minds." - Ralph Waldo Emerson
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 cramer join:2007-04-10 Raleigh, NC kudos:7 | Actually, they wasted their own time... "Sir, what modem are you using?" "SB4100..." "<interrupting>GO TO THE NEAREST TWC OFFICE TO REPLACE THAT MUSEUM EXHIBIT OF A MODEM."
(A friend of mine *just* replaced a 3100. A. F'ing. 3100! No wonder his internet sucked.) |
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 | reply to mpgstuff The one service rep did acknowledge that the Modem was 10 years old, and that's when I'd suggested I would replace it before having a tech come out and see if that fixed the issue. The other service rep was convinced it was my Linksys router and insisted that was the only device that mattered.
Hopefully this will solve everything as Hob/Cramer have suggested. The reason I've waited is - yes I know it is very old - but there have been 0 issues in the past 10 years (speeds fine, low latency, no packet loss). I was skeptical that all of the sudden it would be the fault of the modem, unless they changed a config on their end.
I've purchased an SB6141 and it will be here on Friday. I've read some horror stories of people trying to get them provisioned, so now I am worried about that.
Will they request that when the new modem is provisioned I only have one PC hooked directly into the cable modem? Or can I have it hooked up as I would normally operate with a PC --> router ---> modem? I am nervous because the one tech insisted the router was an issue, that I needed to call Linksys, that I couldn't see modem logs, etc. |
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 hobgoblinSortof AgoblinPremium join:2001-11-25 Orchard Park, NY kudos:8 | reply to cramer "Actually, they wasted their own time... "Sir, what modem are you using?" "SB4100.."
Agreed.
Hob -- "A foolish consistency is the hobgoblin of little minds." - Ralph Waldo Emerson
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 | reply to mpgstuff Not once did either tech support ask me what model cable modem I was using and express that it was old. I did say the model name early in my explanation of the issue I was having.
The first tech support person only acknowledged it was old after I told her that it was 10 years old.
The second tech support was too focused on the Linksys wireless router.
How painful will it be for me to provision the new modem? This IS something that any of the national help desk personnel will be able to handle, correct? Can I be up and running within an hour once I get a person on the phone? |
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